Add social meta tags to enable image previews on posts

[notthetup]

When sharing UnetStack posts in twitter, it doesn’t seem to be able to pick up the blog post thumbnail properly.

We might need to add meta tags to tell twitter what images to use.

https://mobile.twitter.com/unetstack/status/1192288167744786432

https://dev.to/therealdanvega/how-to-add-twitter-card-meta-tags-to-your-blog-4iei

[notthetup]

Doesn't seem to have solved it.

twitter:image still seems empty